[divchief07]

I pulled the cluster on my 67 coupe to replace the non-functioning bulbs with LED's. Now I still have no lights (other than the Brake light). Following advice elsewhere I replaced the ignition switch and the constant voltage regulator with no help. I have no power to three of the fuses and I suspect this may be at least part of the problem. How do I remedy this??

Thanks in advance

 

[Mustangerbob1]

Using a wiring diagram, trace where power is introduced to the circuit for each "dead" fuses. Trace back and find where the power stops.

50 year old harnesses are not happy harnesses.

You need the diagram.

 

[Redneckgearhead]

First and foremost never shotgun parts at a problem. You've added variables that didn't need to be added. To you own a test light or volt meter? What three fuses don't have power?

 

[Rufus68]

Have you rotated the headlight switch fully left and fully right with the switch on to make sure the dimmer setting is not part of the issue? This will control the brightness of the instrument lights.

 

[Magnus]

The constant voltage regulator doesn't do anything with the dash lights. So you can rule that out. It just runs the gauges.
The fuses do affect the lights though, specifically the one in the middle labelled "Inst. L.T."

Also, the fuse box connectors can get dirty and rusty over time so you might want to clean them off too. Disconnect the battery first just to make sure you don't short anything out while you're cleaning.

LEDs can be a little finicky. You might want to find one good old bulb and put it in while you're testing just to make sure you're not having a problem the LEDs. The LEDs dim differently than the old bulbs and they might not work at all if the headlight switch isn't rotated all the way to the left.

IIRC the power to the lights goes from the headlight switch to the fuse to the dash lights so it's possible that your headlight switch is bad, but definitely fix the fuses first.

 

[jp-67Mustang]

Use the attached file for a '67 diagram, or check on Mustang Restoration, How to and Tech | Average Joe Restoration. I believe he has one someplace on his website. jp

 

[divchief07]

First and foremost never shotgun parts at a problem. You've added variables that didn't need to be added. To you own a test light or volt meter? What three fuses don't have power?

I didn't 'shotgun' but replaced parts based on testing and recommendations, but thanks anyway

 

[divchief07]

Have you rotated the headlight switch fully left and fully right with the switch on to make sure the dimmer setting is not part of the issue? This will control the brightness of the instrument lights.

Yep, that would be too easy.

 

[divchief07]

The constant voltage regulator doesn't do anything with the dash lights. So you can rule that out. It just runs the gauges.
The fuses do affect the lights though, specifically the one in the middle labelled "Inst. L.T."

View attachment 800725
Also, the fuse box connectors can get dirty and rusty over time so you might want to clean them off too. Disconnect the battery first just to make sure you don't short anything out while you're cleaning.

LEDs can be a little finicky. You might want to find one good old bulb and put it in while you're testing just to make sure you're not having a problem the LEDs. The LEDs dim differently than the old bulbs and they might not work at all if the headlight switch isn't rotated all the way to the left.

IIRC the power to the lights goes from the headlight switch to the fuse to the dash lights so it's possible that your headlight switch is bad, but definitely fix the fuses first.

I have NO power to the lights since the ONLY fuses with power are the 7.5 and 20 amp ones. I seem to have a vague recollection that the other fuses receive power from the ignition switch, but can't find the reference.

 

[divchief07]

I have NO power to the lights since the ONLY fuses with power are the 7.5 and 20 amp ones. I seem to have a vague recollection that the other fuses receive power from the ignition switch, but can't find the reference.

All is pretty clean but that can't be the issue since I have no power to the cluster fuse
Thanks

 

[Rufus68]

This picture shows the power in source for the fuses:

 

[divchief07]

Use the attached file for a '67 diagram, or check on Mustang Restoration, How to and Tech | Average Joe Restoration. I believe he has one someplace on his website. jp

NICE! THANKS! i WILL RUN IT DOWN THIS WEEK. i HOPE!!
STEVVE

 

[divchief07]

NICE! THANKS! i WILL RUN IT DOWN THIS WEEK. i HOPE!! ALSO I MAY HAVE TWO PROBLEMS SINCE THE DEAD FUSES HAVE TWO DIFFERENT INPUTS!!?? IT IS NEVER EASY IS IT??

STEVE

 

[Flade]

Sounds like an issue with the headlight switch or wiring. Might want to consider sending your dash harness to Midlife for refurbishment.